Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
Pankow and his colleagues analyzed aerosolized e-liquid in tank system e-cigarettes to detect formaldehyde-releasing agents in hidden form at various voltages. They found that vaping 3 milligrams of e-cigarette liquid at a high voltage can generate 14 milligrams of loosely affiliated or hidden formaldehyde. Researchers estimated a tobacco smoker would get .15 milligrams of formaldehyde per cigarette or 3 milligrams in a 20-pack.